Drafting ruler



FIG. 1 is a front elevational view of a drafting ruler showing my new design, the rear elevational view being flat, plain and unornamented;

FIG. 2 is a top edge view, the bottom edge view being identical; and

FIG. 3 is a right side edge view thereof, the left side edge view being identical. 

The ornamental design for a drafting ruler, as shown and described. 